No error , No gain

I saw this question, but I didn't see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it just a case of checking for ""? If you just want to check whether there's a truthy value, you can do: if (strValue) { //do something } If you need to check specifically for an empty string over null, I would think checking against "" is your best bet, using the ==..

Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers without enough detail may be edited or deleted. Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3..

How do I select the element that is a direct parent of the anchor element? As an example, my CSS would be something like this: li < a.active { property: value; } Obviously there are ways of doing this with JavaScript, but I'm hoping that there is some sort of workaround that exists native to CSS Level 2. The menu that I am trying to style is being spewed out by a CMS, so I can't move the active ..

How can I view the change history of an individual file in Git, complete details with what has changed? I have got as far as: git log -- [filename] which shows me the commit history of the file, but how do I get at the content of each of the file changes? I'm trying to make the transition from Microsoft Visual SourceSafe and that used to be a simple right-click → Show history. For a graphical vi..

I know references are syntactic sugar, so code is easier to read and write. But what is the difference between a pointer variable and a reference variable? A pointer can be re-assigned: int x = 5; int y = 6; int *p; p = &x; p = &y; *p = 10; assert(x == 5); assert(y == 10); A reference cannot be re-bound, and must be bound at initialization: int x = 5; int y = 6; int &q; // error int &r = x; A po..

Until today, I thought that for example: i += j; Was just a shortcut for: i = i + j; But if we try this: int i = 5; long j = 8; Then i = i + j; will not compile but i += j; will compile fine. Does it mean that in fact i += j; is a shortcut for something like this i = (type of i) (i + j)? As always with these questions, the JLS holds the answer. In this case §15.26.2 Compound Assignment Operators..

I'd like to round at most 2 decimal places, but only if necessary. Input: 10 1.7777777 9.1 Output: 10 1.78 9.1 How can I do this in JavaScript? Use Math.round() : Math.round(num * 100) / 100 Or to be more specific and to ensure things like 1.005 round correctly, use Number.EPSILON : Math.round((num + Number.EPSILON) * 100) / 100 Brian Ustas If the value is a text type: parseFloat("123.456").toFi..

Is there a (Unix) shell script to format JSON in human-readable form? Basically, I want it to transform the following: { "foo": "lorem", "bar": "ipsum" } ... into something like this: { "foo": "lorem", "bar": "ipsum" } With Python 2.6+ you can do: echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool or, if the JSON is in a file, you can do: python -m json.tool my_json.json if the JSON i..

This question already has answers here: How do I efficiently iterate over each entry in a Java Map? (46 answers) Closed 1 year ago. What's the best way to iterate over the items in a HashMap? If you're only interested in the keys, you can iterate through the keySet() of the map: Map map = ...; for (String key : map.keySet()) { // ... } If you only need the values, use values(): for (Object value..

What is the module/method used to get the current time? Use: >>> import datetime >>> datetime.datetime.now() datetime.datetime(2009, 1, 6, 15, 8, 24, 78915) >>> print(datetime.datetime.now()) 2009-01-06 15:08:24.789150 And just the time: >>> datetime.datetime.now().time() datetime.time(15, 8, 24, 78915) >>> print(datetime.datetime.now().time()) 15:08:24.789150 See the documentation for more info..